The Spark sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront. The optimal warmth to weight ratio and 850+ FILL Power makes this bag as comfortable as it is compact and easily packable. Goose Down with Ultra Dry Down treatment for improved water resistance in damp conditions. Featuring 10-Denier Nylon shell and lining fabric, these lightweight fabrics offer breathability, protection and effective temperature regulation for premium comfort in the outdoors. 10D Nylon's waterproof and breathable features offer added protection and prevents exposure to tent wall condensation. The Mummy Fit maximises thermal efficiency and offers greater heat retention with a lightweight design for warmth, compactness, and comfort in the outdoors. 850+ FILL Power, RDS- certified, Goose Down with Ultra Dry Down treatment for improved water resistance in damp conditions 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and foot box. Mummy Fit: Fitted cut with generous foot box and technical hood, to maximise thermal efficiency and minimise bulk and weight. Spark -9C/15F Primary zip: 3/4 length #5 with zip-plow and two sliders. Vertical chest baffles, horizontal baffles lower half and base. SPARK -9C/15F box wall baffle construction throughout. Standard front draft collar. Technical fitted hood with soft touch adjustment. Extra deep for a cosy like feel. Single, down-filled, draft tube along the top of all zippers. Spark -9 Pairs with Women's Sea to Summit bags and Pairs with STS quilts. Supplied with Ultra-Sil compression bag and storage cell. Bag weight 730g Fill weight 480g Suitable for body height to 180 Cm Season rating 3.5 TEMPERATURE RATING (EN LOWER LIMIT) Comfort -2 °C with Lower Limit -8 °C Spark Ultralight Sleeping Bag -9°C Regular